Error
Error Code:
1727
MySQL Error 1727: Unsafe AUTO_INCREMENT Key
Description
Error 1727 indicates an unsafe operation involving an `AUTO_INCREMENT` column that is part of a composite primary key, but not its leading column. This situation is considered unsafe for statement-based replication, as it can lead to data inconsistencies between a primary server and its replicas. The database flags this operation to prevent potential replication failures and data integrity issues.
Error Message
INSERT into autoincrement field which is not the first part in the composed primary key is unsafe.
Known Causes
3 known causesIncorrect Composite Primary Key Order
An `AUTO_INCREMENT` column is defined as part of a composite primary key, but it is not the first column in the key's definition.
Statement-Based Replication Incompatibility
The database is configured for statement-based replication, which cannot safely handle `AUTO_INCREMENT` columns not leading a composite primary key due to potential non-deterministic value generation.
Legacy Table Schema
Using older table designs where `AUTO_INCREMENT` was combined with other fields in a composite primary key without considering modern replication best practices.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service